Add docs for rocket_db_pools feature flag

Cleanup and docs after merging of #104

Author: ralpha

README.md

@@ -114,6 +114,7 @@ Rocket-Okapi:
 - `mtls`: Enable [mutual TSL for Rocket](https://rocket.rs/v0.5-rc/guide/configuration/#mutual-tls).
 (when same Rocket feature flag is used.)
 - `rocket_dyn_templates`: Enable compatibility with [`rocket_dyn_templates`](https://crates.io/crates/rocket_dyn_templates).
+- `rocket_db_pools`: Enable compatibility with [`rocket_db_pools`](https://crates.io/crates/rocket_db_pools).
 
 Note that not all feature flags from [`Schemars`][Schemars] are re-exported or enabled.
 So if you have objects for which the `JsonSchema` trait is not implemented,

rocket-okapi/CHANGELOG.md

@@ -43,8 +43,11 @@ because of incompatibility.
   - `rocket::http::uri::Host`
   - `Certificate` (when `mtls` feature is enabled)
   - `FlashMessage`
+  - `rocket_db_pools::Connection<D>` (when `rocket_db_pools` feature is enabled) (#104)
 - New feature flag `rocket_dyn_templates` for enable compatibility with
 [`rocket_dyn_templates`](https://crates.io/crates/rocket_dyn_templates).
+- New feature flag `rocket_db_pools` for enable compatibility with
+[`rocket_db_pools`](https://crates.io/crates/rocket_db_pools).
 - New example for Rocket's Dynamic Templates.
 
 ### Changed

rocket-okapi/src/request/from_request_impls.rs

@@ -162,13 +162,6 @@ impl<'r, T: Send + Sync + 'static> OpenApiFromRequest<'r> for &'r rocket::State<
     }
 }
 
-#[cfg(feature = "rocket_db_pools")]
-impl<'r, T: rocket_db_pools::Database> OpenApiFromRequest<'r> for rocket_db_pools::Connection<T> {
-    fn from_request_input(_gen: &mut OpenApiGenerator, _name: String, _required: bool) -> Result {
-        Ok(RequestHeaderInput::None)
-    }
-}
-
 impl<'r, T: OpenApiFromRequest<'r>> OpenApiFromRequest<'r> for Option<T> {
     fn from_request_input(gen: &mut OpenApiGenerator, name: String, _required: bool) -> Result {
         T::from_request_input(gen, name, false)
@@ -180,3 +173,13 @@ impl<'r, T: OpenApiFromRequest<'r>> OpenApiFromRequest<'r> for StdResult<T, T::E
         T::from_request_input(gen, name, required)
     }
 }
+
+// ## Implementations for other crates
+// https://docs.rs/rocket_db_pools/0.1.0-rc.2/rocket_db_pools/struct.Connection.html#impl-FromRequest%3C%27r%3E
+
+#[cfg(feature = "rocket_db_pools")]
+impl<'r, D: rocket_db_pools::Database> OpenApiFromRequest<'r> for rocket_db_pools::Connection<D> {
+    fn from_request_input(_gen: &mut OpenApiGenerator, _name: String, _required: bool) -> Result {
+        Ok(RequestHeaderInput::None)
+    }
+}